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Consider NFPA 13

NFPA 13 does not require that electrical equipment rooms must provide an enclosure with a 2 hour fire rating, but if it does not, if the building requires sprinklers, then the electric room requires sprinklers.
8.15.10.3 Sprinklers shall not be required in electrical equipment
rooms where all of the following conditions are met:
(1) The room is dedicated to electrical equipment only.
(2) Only dry-type electrical equipment is used.
(3) Equipment is installed in a 2-hour fire-rated enclosure
including protection for penetrations.
(4) No combustible storage is permitted